From cf28eeb2a120fe3f263235c35fe5603013f88049 Mon Sep 17 00:00:00 2001
From: Jermolene <jeremy@jermolene.com>
Date: Mon, 28 Nov 2016 13:45:41 +0000
Subject: [PATCH] Fix problem with checkbox widget and empty strings

If the value of `tiddler.fields[this.checkboxField]` was an empty
string then it would incorrectly fall back to the value of
`this.checkboxDefault`.
---
 core/modules/widgets/checkbox.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/core/modules/widgets/checkbox.js b/core/modules/widgets/checkbox.js
index 2480ff319..6c1d64feb 100644
--- a/core/modules/widgets/checkbox.js
+++ b/core/modules/widgets/checkbox.js
@@ -65,7 +65,12 @@ CheckboxWidget.prototype.getValue = function() {
 			}
 		}
 		if(this.checkboxField) {
-			var value = tiddler.fields[this.checkboxField] || this.checkboxDefault || "";
+			var value;
+			if($tw.utils.hop(tiddler.fields,this.checkboxField)) {
+				value = tiddler.fields[this.checkboxField] || "";
+			} else {
+				value = this.checkboxDefault || "";
+			}
 			if(value === this.checkboxChecked) {
 				return true;
 			}